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See Technical Specifications

UCC2946D

-40°C to +90°C, microprocessor supervisor with watchdog timer

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

UCC2946D
Datasheet:

UCC2946D Datasheet (PDF)
Programmable:

Not Verified
Type:

Simple Reset/Power-On Reset
Number of Voltages Monitored:

1
Voltage - Threshold:

Adjustable/Selectable
EDA/CAD Models:

Request Free CAD Models for UCC2946D

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UCC2946D General Description

The UCCx946 is designed to provide accurate microprocessor supervision, including reset and watchdog functions. During power up, the device asserts a reset signal RES with VDD as low as 1 V. The reset signal remains asserted until the VDD voltage rises and remains above the reset threshold for the reset period. Both reset threshold and reset period are programmable by the user.

The UCCx946 is also resistant to glitches on the VDD line. Once RES has been deasserted, any drops below the threshold voltage need to be of certain time duration and voltage magnitude to generate a reset signal. These values are shown in Figure 1. An I/O line of the microprocessor may be tied to the watchdog input (WDI) for watchdog functions. If the I/O line is not toggled within a set watchdog period, programmable by the user, WDO is asserted. The watchdog function is disabled during reset conditions.

The UCCx946 is available in 8-pin SOIC(D), 8-pin PDIP (N) and 8-pin TSSOP(PW) packages to optimize board space.

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Key Features

Fully Programmable Reset Threshold
Fully Programmable Reset Period
Fully Programmable Watchdog Period
2% Accurate Reset Threshold
Input Voltage Down to 2 V
Input 18-µA Maximum Input Current
Reset Valid Down to 1 V

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)Supervisors	Series	-
Programmable	Not Verified	Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1	Voltage - Threshold	Adjustable/Selectable
Output	Push-Pull, Totem Pole	Reset	Active Low
Reset Timeout	140ms Minimum	Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Base Product Number	UCC2946